Add graphql introspection module

[mukesh-dream11]

This module probes for GraphQL endpoints, and attempts to extract schemas if found. The module itself is just a starting point, there can be further improvements added such as authentication and unit tests for this module.

[TheTechromancer]

@mukesh-dream11 thanks for the PR

@liquidsec this might be useful for lightfuzz

Also relevant: #766

[codecov]

Codecov Report

Attention: Patch coverage is 98.30508% with 1 line in your changes missing coverage. Please review.

Project coverage is 93%. Comparing base (a4201ba) to head (e984b37).
Report is 21 commits behind head on dev.

Files with missing lines	Patch %	Lines
bbot/modules/graphql_introspection.py	98%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #2515   +/-   ##
=====================================
+ Coverage     93%     93%   +1%     
=====================================
  Files        400     402    +2     
  Lines      33202   33261   +59     
=====================================
+ Hits       30693   30753   +60     
+ Misses      2509    2508    -1     

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[mukesh-dream11]

@TheTechromancer I've added unit tests and the web-basic flag to this module. Feel free to change flags if you believe this fits better under a different category. I believe web-basic is appropriate because this module is designed to send a maximum of 3 requests to any given root URL (sub-URLs are ignored for now).

I'm done with this PR, so I'm handing this off for review. :)

[TheTechromancer]

Thanks @mukesh-dream11, solid module. I made a couple small tweaks -- one to help dedupe incoming URLs, and another rename the .json file instead of creating a separate output dir for each. Let me know if these are okay.

[mukesh-dream11]

Yeah @TheTechromancer this is solid.

[ausmaster]

Good stuff!